Driving equipment by an alternating current electro-magnet



KANEKO TABE Aug. 4, 1970 DRIVING EQUIPMENT BY AN ALTERNATING CURRENT ELECTED-MAGNET Filed Jan. 10, 1968 1.2 1.4 1-6 1-: Shaka (Cm) INVENTOR KANEKO TABE BY W m kl m ATTORNEY 3,522,567 DRIVING EQUIPMENT BY AN ALTERNATING CURRENT ELECTRO-MAGNET Kaneko Tabe, 4 Mitsuya-Kitadori-S-chome, Higashiyodogawa-ku, Osaka, Osaka-fu, Japan Filed Jan. 10, 1968, Ser. No. 696,767 Claims priority, application Japan, Jan. 18, 1967,

I 2/3,502 Int. Cl. H01f 3/00, 7/10, 7/13 us. Cl. 335-251 1 Claim ABSTRACT OF THE DISCLOSURE An alternating current electro-magnet that has a suflinating current electro-magnet to a driving shaft. Two links forming a hook shape are connected together and to the plunger and the driving shaft, respectively. The center lines of the plunger and the driving shaft are aligned. The bottom edge of 'one of the links actsas-a fulcrum to transmit the impulse from the links to the driving shaft.

An alternating current electro-magnet that has a sufficiently strong attraction power even over a relatively long distance (for instance, 10 mm. to 20 mm.) is provided.

The present invention also relates to a method of trans- United States Patent a difference in motion between them, and thus creating the relation: I I

wherein the magnification of the motion is the attractive force of the electro-magnet is P and the attraction power of the driving shaft is Q.

The invention will now be described with particular reference to the accompanying drawings, in which:

FIG. 1 is a front view of the equipment in accordance with the present invention;

FIG. 2 is its side view;

FIG. 3 is a front view of an essential part of the FIG. 1;

FIG. 4 is a diagram to show characteristics of a certain alternating current electro-magnet;

FIG. 5 is a diagram to show relation of force by means of obtaining from FIG. 4 an impulse which consists of the product of an attractive force and a stroke.

In FIG. 4, characteristics of a certain electro-magnet have been illustrated. Alternating current electro-magnets of this kind have somewhat similar characteristics. In a position where a stroke is comparatively long, for example at a position ranging from 1.0 to 1.4 cm. in the diagram, the rate of decrease in the attractive force be comes low and consequently the curved line becomes horizontal.

This means that the longer the stroke becomes, the greater the impulse that can be obtained. In this connection, it can be said that as seen in FIG. 5, the relation of force becomes clearer by obtaining from FIG. 4 an impulse which consists of the product of the attractive force and the stroke.

7 3,522,567 Patented Aug. 4, 1970 is frequently the case that the driving length is far smaller than the stroke of the plunger and yet a larger attraction power is required. In order to solve this problem, the present invention provides an arrangement which can transmit the impulse of the electro-magnet to the driving shaft most effectively.

It the attached drawings, 1 is an electro-magnet, 2

is a plunger, 3 is the first link, 4 is a pin to connect the plunger 2 and the first link 3, 5 is the second link, 6 is a pin to connect the first link 3 and the second link 5, 7 is a driving shaft, 8 is a pin to connect the second link 5 and the driving shaft 7, 9, 9' is an interval tube inserted between the first and second links with the pin 6 passing there-through, 10', 10', 11, 11 are respectively stopping rings (nuts) for the pin 4 and 6, 12 is a return spring, 13 is a frame to support the driving shaft 7 and 14 is the top of the frame 13. The first and second links are hinged in a hook-shape between the plunger 2 and the driving shaft 7. When the electro-magnet is not electrically charged, the driving shaft 7 is pulled down by the spring 12, the second link 5 is pulled down by the pin 8 fixed on the upper end of the driving shaft 7, and thus the lower side of the second link 5 becomes horizontal, as seen in FIG. 1, contacting the top of the frame 13 which supports the driving shaft 7. Accordingly, the plunger 2 which is connected with the second link 5 through the first link 3 is kept in the lowest position.

In the present invention, the above-mentioned position of the plunger is determined so as to provide the stroke length to achieve the greatest impulse of the electromagnet to be used. The lengths of the two links are proportioned such that when the electro-magnet is electrically charged and the plunger 2 is attracted upward to the full as seen in FIG. 3 and the driving shaft 7 is lifted through the two links, the distance of movement of the driving shaft 7 agrees with the desired driving length.

In the situation as shown in FIG. 3, assuming the stroke of the plunger to be d and the amount of movernent of the pin 6 to be pressed upward by the stroke to be c, the length of movement 0 has such relation as:

larger than 2. Now, naming labeling ratio d/c as K, the following equation is obtained:

Hence, d=c:K or c=d/K.

When the pin 6 is pressed upward, the second link stands up with a point of contact 15 as a fulcrum, which is located at the right end of the lower side of the second link 5 contacting the top 14 of the frame 13. Thus, the driving shaft 7'is pulled upwardly by the pin 8 in opposition to the spring 12.

Assuming the amount of attraction, i.e. the driving length of the driving shaft, to be L, the distance between the point of contact 15 on the lower side of the second link and the pin 8 to be a and the distance between the Further, K will be explained with reference to FIG. 1 and FIG. 3. In order to make the amount of movement of the first link 3 and that of the second link 5 as large as possible, it is desirable that as seen in FIG. 1, the lower surface of the plunger 2 and the upper side of the link 5 be situated as close to each other as possible. In order to carry out this, it is desirable that e be equal to or larger than b and that the relation between e and b be maintained about 2:1. On the other hand, when e is smaller than b, the larger the dilference becomes, the more the second link 5 inclines from horizontal direction to vertical direction and yet the more the effective amount pin 6 and the pin 8 to be h, the relation between and L 7 smaller than f/ 2. From structural point of view, practical becomes approximately; ratio is approximately b:a=l0:1.

c:L=b:a In conclusion, the following equation can be obtained. Hence: b

L Thus, the most effective value of Since c=d/K, by substituting for c in the above equation, b a 1 10 should be in such range as 2 to 20. L a In this specification, the inventor has hitherto described H only a hook-shaped linking structure. However, it is possib ble to combine two hook-shaped linking structures sym- =K. .L metrically in a diamond shape for maintaining a balance a (1) of force in structure and for obtaining the same effect Thus, a double lever structure is formed. Further, asas the abovementioned single hook-shaped linking strucsuming the attractive force of the plunger to be P and ture. the attraction power of the driving shaft to be Q, then: What I claim is: d P=L Q. 1. An apparatus for transmitting an impulse from the Since plunger of an alternating current electro-magnet to a b driving shaft wherein the center lines of said plunger d=K--L and said drive shaft are aligned in a straight line, comprising a first link pivoted at one end to said plunger, 111% above equatiim becomes a second link pivoted at one end to the other end of b a said first link and pivoted at the other end to said drive a' X XQ shaft, said first and second links forming a hook shape, and a casing surrounding said driving shaft, the bottom Hence: edge of said second link forming a fulcrum on the top of b said casing when said impulse is transmitted from said Q= (2) plunger to said driving shaft.

References Cited UNITED STATES PATENTS 789,457 5/1905 Sargent 335l31XR FOREIGN PATENTS 841,6 12 6/1952 Germany.-

BERNARD A. GILHEANY, Primary Examiner D. M. MORGAN, Assistant Examiner U.S. Cl. X.R. 335279 

